2507 Stainless Steel Round Bar | Super Duplex Powerhouse for Extreme Conditions
✓ Unrivaled Strength: Yield strength ≥550 MPa – 2.5x stronger than 316L – enabling lighter, thinner designs.
✓ Corrosion Supremacy: PREN ≥42, validated by 15,000+ hours in ASTM G48 Method D seawater crevice corrosion testing.
✓ Stress Corrosion Immunity: Resists chloride-induced SCC up to 200°C (392°F) under NACE TM0177.
✓ Welding Precision: Maintains phase balance with AWS A5.9 ER2594 filler, no post-weld heat treatment required.
2507 Stainless Steel Round Bar (UNS S32750)
Engineered to dominate the most aggressive environments, 2507 super duplex stainless steel round bars combine a balanced austenitic-ferritic microstructure with ultra-high alloy content (25% Cr, 7% Ni, 4% Mo, 0.3% N) to deliver unmatched strength and corrosion resistance. Certified to ASTM A276/A479 and NACE MR0175/ISO 15156, this premium grade outperforms standard duplex steels in chloride-rich, acidic, and high-pressure applications, making it indispensable for subsea oil & gas, desalination, and chemical processing industries.
- Diameter Range: 6mm–350mm (hot-rolled ±0.5%; cold-drawn ±0.03mm)
- Length: 2m–12m standard (cut-to-length precision ±1mm)
- Surface Finishes: Hot Rolled, Pickled & Passivated, Polished (Ra ≤0.6μm), Electropolished (Ra ≤0.3μm)
- Mechanical Properties: Yield Strength ≥550 MPa | Tensile Strength ≥750 MPa | Elongation ≥25% | Hardness ≤310 HBW
| Parameter Category | Value/Description |
|---|---|
| Material Grade | UNS S32750 (per ASTM A276) |
| Composition (%) | C≤0.03, Cr 24.0-26.0, Ni 6.0-8.0, Mo 3.0-4.0, N 0.24-0.32, Mn≤1.2, Si≤0.8, P≤0.035, S≤0.02 |
| Tensile Strength (MPa) | ≥800 (Solution Annealed) |
| Yield Strength (MPa) | ≥550 (Solution Annealed) |
| Elongation (%) | ≥15 (50mm gauge length) |
| Hardness | Brinell (HBW): ≤310；Rockwell (HRC): ≤32 (Solution Annealed) |
| Density (g/cm³) | 7.80 |
| Melting Range | 1350-1400℃ |
| Thermal Conductivity (W/m·K) | 15.0 (20℃) |
| Thermal Expansion (10⁻⁶/℃) | 13.0 (20-100℃) |
| Electrical Resistivity (Ω·m) | 0.85×10⁻⁶ (20℃) |
| Elastic Modulus (GPa) | 200 |
| Magnetic Properties | Weakly magnetic (due to duplex microstructure) |
| Corrosion Resistance | Exceptional resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion (PREN ≥42); resistant to sulfuric acid, acetic acid, and seawater |
| Heat Treatment | Solution Annealing: 1020-1120℃ followed by rapid cooling (water quenching) |
| Surface Finishes | Black (Hot-rolled), Cold-drawn, Polished, Pickled & Passivated |
| Dimension Range | Diameter: 5mm-300mm; Length: 3000mm/6000mm (standard) |
| Standards | ASTM A276/A479, EN 10088-3, NORSOK MDS D45, ASME SA276 |
| Applications | Offshore oil & gas systems, seawater desalination plants, chemical processing equipment, heat exchangers, subsea pipelines, high-pressure valves |
2507 Stainless Steel Round Bar Applications
| Industry | Critical Components | 2507 Round Bar Advantage |
|---|---|---|
| Subsea Oil & Gas | X-mas tree valves, downhole tools | Resists H₂S cracking at 25,000 ppm and 150°C (302°F). |
| Desalination | High-pressure pump shafts, brine heaters | Withstands 45,000 ppm chloride at 90°C (194°F). |
| Chemical Processing | Sulfuric acid concentrators, HCl reactors | 0.005mm/year corrosion rate in 70% H₂SO₄ at 80°C. |
| Nuclear Waste | Spent fuel casks, reprocessing equipment | Immune to nitric acid corrosion up to 95% concentration. |
2507 Stainless Steel Round Bar Product Packaging
2507 Stainless Steel Round Bar are precision-engineered for superior corrosion resistance and mechanical strength, meeting ASTM A276 and ISO 3506 standards. To ensure optimal performance from factory to your facility, we implement rigorous packaging protocols and logistics safeguards.
Small Bars (<50mm)
Bundled with steel straps + VCI-coated wraps, crated on reinforced wooden pallets.
Large Bars (≥50mm)
End caps + edge protectors, stacked in custom steel racks with desiccant units.
Anti-Scratch Sleeving
Silicone-impregnated fabric for polished/ground surfaces.
RFID Tags
Embedded tracking chips with real-time material certification access.
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
2507 Stainless Steel Round Bar Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: How does 2507 compare to 2205 duplex stainless steel?
A: 2507 offers 30% higher strength and PREN 42 vs 34, making it mandatory for >20,000 ppm chloride or >150°C service.
Q2: What welding parameters prevent sigma phase formation?
A: Use ER2594 filler with 0.8-1.2 kJ/mm heat input, interpass T ≤100°C, and argon backing gas (99.999% purity).
Q3: Are bars compliant with nuclear industry standards?
Yes, all shipments include:
- ASME Section III Division 3 certification
- ISO 9328-4 NDT reports (UT/PT/RT)
- NACE MR0103 for sour service
Q4: What’s the MOQ for electropolished bars?
Standard sizes: 5 tons.
Custom electropolished bars: 10 tons (lead time 35 days).
Q5: How to prevent pitting in stagnant seawater?
A: Specify Electropolished + Passivated Finish – reduces pitting potential by 95% (per ASTM A967 Method C).
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